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US 10,504,650 B2Granted
Multi-layer ceramic capacitor
AssigneeTDK Electronics Co., Ltd.
InventorsTomoya Imura, Goushi Tauchi, Masakazu Hirose, Tomohiro Terada
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Abstract
A multi-layer ceramic capacitor is disclosed. In an embodiment the dielectric composition includes a perovskite crystal structure containing at least Bi, Na, Sr and Ti, wherein the dielectric composition includes a low-Bi phase in which a Bi concentration is no greater than 0.8 times the mean Bi concentration in the dielectric composition as a whole.
Claims17
A dielectric composition comprising:
- a perovskite crystal structure containing at least Bi, Na, Sr and Ti,
- wherein the dielectric composition includes a low-Bi phase in which a Bi concentration is not greater than 0.8 times a mean Bi concentration in the dielectric composition as a whole.
A method for providing a laminated ceramic capacitor, the method comprising:
- providing a dielectric starting material from powders of bismuth oxide (Bi2O3), sodium carbonate (Na2CO3), strontium carbonate (SrCO3) and titanium oxide (TiO2);
- preparing a green chip using a sheet method or a printing method employing a paste for dielectric layers and a paste for internal electrodes, wherein the paste for the dielectric layers is an organic paint comprising a mixture of the dielectric starting material and an organic vehicle or wherein the paste for the dielectric layers is an aqueous paint comprising a mixture of the dielectric starting material and an aqueous vehicle;
- performing a debinding treatment on the green chip;
- baking the green chip thereby forming a main body;
- printing or transcribing external electrodes on the main body;
- and
- baking the main body comprising a dielectric composition,
- wherein the dielectric starting material is weighed out such that the dielectric composition has a perovskite crystal structure containing at least Bi, Na, Sr and Ti, and wherein the dielectric composition includes a low-Bi phase in which a Bi concentration is not greater than 0.8 times a mean Bi concentration in the dielectric composition as a whole.
5 more elements
Dependencies are inferred from the claim text.